Elastic wave manipulation and low-frequency vibration absorption based on ultralight plate-type metamaterials
摘要：The bending wave bandgap is an important topic for the applications of plate-type structures in low frequency vibration and noise reduction. Since mode conversion of several Lamb wave modes will occur in dispersion curves, it is difficult to directly extract the ranges of the bending wave bandgap from the band structure. To this end, this paper proposes a modal displacement method for extracting the flexural wave band gap of thin-plate acoustic metamaterials. This method replaces the qualitative mode analysis process by quantitatively extracting the statistical average modal displacement of the thin plate, and realizes the quantitative determination of the band gap. In addition, using this modal displacement method, a thin-plate ultralight low-frequency damping vibration absorber based on acoustic band gap is designed. Because this design method achieves vibration reduction through the band gap characteristics of the local resonance structure, and the band gap is often a certain width, so that as long as the vibration within the band gap range, it can be well attenuated.